Which choice best states the main purpose of the text? | Verbal SAT Question

In their study of fossils of the extinct arthropod Mollisonia symmetrica, Javier Ortega-Hernández, Rudy Lerosey-Aubril, and team reported some obvious indications of M. symmetrica’s nervous system—for example, nerves extending into the animal’s body parts. Most intriguingly, they also saw signs of what might be a synganglion, a brain-like nerve mass, in the animal’s head. This is an exciting possibility; without evidence of a synganglion, we can’t tell exactly how M. symmetrica relates to mosquitoes, slipper lobsters, and other arthropods.

Which choice best states the main purpose of the text?

To describe M. symmetrica and the way nerves extending into the animal’s body parts functioned

To question whether the fossils the team studied were actually of M. symmetrica

To discuss a significant feature that may have been found in a study of M. symmetrica fossils

To argue that M. symmetrica may have been more similar to mosquitoes than to slipper lobsters